Hello Greasytshirt, I have a 2010 Hino 258 rollback with 259k on it.New hire used last weekend. I got it back last tuesday, and noticed that the DPR bars were at H. The truck has never gone over 4 bars. The kid said he saw no light flash for the regen.The truck still runs fine, no limp mode, etc.The check engine light has been on since i have owned. I cannot get it to regen. Any advice?